Castellated nut and method of making the same



June 26, 1928.

H. G. NORWOOD CASTELLATED NUT AND METHOD OF MAKING THE SAME Original Filed March 16, 1925 V (31100 for, f/oawwi,

Patented June 26, 1928.

UNITED STATES PATENT OFFICE.

HARRY G. NORWOOD, F BALTIMORE, MARYLAND, ASSIGNOB 0F ONE-THIRD TO WIL- LIAM C. O'BRIEN AND ONE-THIRD TO CHARLES B. ROGERS, BOTH OF BALTIMORE,

MARYLAND.

CASTELLATED. NUT AND METHOD OF MAKING THE SAME.

Application filed larch 16', 1925, Serial No. 15,996. Renewed July 18, 1927.

This invention relates to a method of makin castellated nuts and to the nut made accordlng to said method. In carrying out the invention, I provide a metal bar pref- 6 erably, though not necessarily angular in cross section, and having shallow grooves extending longitudinally of the bar and evenly spaced apart circumferentially of the bar. Where the bar is angular in cross section, these rooves are located centrally in the several aces of the bar. In forming a nut from the bar, the end of the bar is bored centrally, to form the hole in the nut,

and at the same time the bar is counter- 1 bored for a short distance to a diameter which causes the inner wall of the counterbored part to intersect the rooves in the bar. Thus, the bottoms of e channels or grooves in the bar are removed from the counterbored part of the rod, leaving the parts between the grooves standing as a castellated rim. The bar is then severed at a suitable distance back of the castellated rim and the cut-off part is a castellated nut, complete except for the threading operation.

In a suitable automatic machine, provided with a boring and counterborin tool and a cross-cutting tool and suitab e feeding mechanism for the bar, the nuts may be made quite cheaply and quickly and with only two operations.

In the accompanying drawin Fi 1 is a perspective view 0%a bar from whic the nuts are to be made;

Fi 2 is a similar view showing'the end of t e bar after it has been bored and counterbored;

Fig. 3 is a similar view showing the nut cut ofl from the end of the bar;

Fig. 4 is a similar view showing the bar after the nut has been cut off;

Fig. 5 is a plan view of the castellated end of a nut made according to my invention; and,

Fi 6 is a section through the same on the line 66 of Fig. 5.

Referring to'Fig. 1 of the drawing, a represents a metal bar which, as shown in the drawing, is hexagonal in cross section and formed with relativel shallow. moves 1, extending longitudinal y of the ar in the central part of each of its faces. In formin the nuts from this bar, the end of the ar is bored centrally, as indicated at 2, in Fig. 2, to form the hole in the nut, and at the same time, and with the same tool, the end of the bar is counterbored for a short distance, as indicated at 3, the radius of the counterbored part being slightly greater than the distance from the center of the bar to thecenter of one of the channels, so that the counterbored part intersects the channels, and the counterboring tool removes the bottoms of the channels, leaving the parts 4 between the channels standing as a castellated rim. With a cross-cutting tool, the bar is severed at a suitable distance back of the counterbored part, the severed portion constituting the nut n, Fig. 3,which is complete except for the internal threadirkg of the nut. After a nut has been cut 0 the end of the bar presents the appearance shown in Fig. 4, in which 2 is the conical opening made by the point of the boring tool, in the previous operation. It will be evident that by boring and counterboring this end of the bar and cuttin off the bar at the proper distance back 0 the counterbored part, another nut will be formed.

Round bars may be used, if desired, to form the nuts, but this requires deeper grooves in the periphery of the bar for the same amount of metal in the castellations than is necessary where the bars are of angular cross section. It is also desirable, of course, to make the nuts of angular cross section for convenience in turning them with wrenches.

What I claim is:

1. A castellated nut having a plurality of faces and a longitudinal groove in the central art of each face, said nut having a central opening and a counterbore in one end, the latter intersecting said grooves.

2. The method of making a castellated nut which comprises forming longitudinall extending spaced grooves in the sides of the metal body from which the nut is to be made, boring said body to provide a central opening and counterboring one end of said body to a diameter such that the wall of the counterbored part intersects the .,grooves.

3. The method of making castellated nuts which comprises forming a metal bar with longitudinal grooves spaced apart about thebar, boring a central opening in the end of the bar, counterborin said end to a diameing a central opening in the end of the bar,

ter such that the wal of the counterbored counterborin said end to a diameter such part intersects the grooves, cutting off the that the wal of the counterbored part inend portion of the bar at a point back of tersects the grooves, cuttin oil the end porl5 5 the counterbored part, and repeating the tion of the bar at a point ack of the counboring, counterboring and cutting ofl operaterbored part, and repeating the boring,

tions on successive end portions of the bar. counterboring and cutting ofi' operations on 4. The method of making castellated nuts successive end portions of the bar.

which comprisesformin a metal bar with In testimony whereof I hereunto aflix my 20 10 a plurality of angular aces and with lonsignature.

gitudinal grooves midway of the faces, bor- HARRY G. NORWOOD. 

